Variable Density Logging(VDL)

Variable Density Logging(VDL) SITAN Variable Density Logging(VDL) series include two series: with sectors and without sectors. Both series are designed for direct reading and storage modes integration. The singles of SITAN Variable Density Logging(VDL) consist of a CBL signal and a VDL signal....

SITAN Variable Density Logging(VDL) series include two series: with sectors and without sectors.

Both series are designed for direct reading and storage modes integration.

The singles of SITAN Variable Density Logging(VDL) consist of a CBL signal and a VDL signal. The CBL single reflects the condition of the first cement surface, and the VDL supplements the analysis of the first cement surface and reflects the second cement surface.

Memory function is available, can complete the tasks in horizontal well and directional well (not direct reading).

Specification

OD

43mm(1.69in)

70mm(2.75in)

Length

4412mm

5118mm

Max working temperature

177℃

Max pressure

100Mpa(14500psi)

Working voltage

18V

CBL transmitting time

±2µsec

Gamma measuring range

0cps～2000cps

GRsensitivity

≥3CPS/API (Min.)

Logging speed

550m/h

Suitable casing

2.5in~4.5in

4.5in~9in

Case study

This is a real measured cementing quality figure with SITAN BSM70-200D 8-sectorVariable Density Logging tool.We can see that in 210 m - 215m, look from the CBL curves and variable density grayscale image show the cement bond here is good, but we can see that there is obviously visible cement channeling in the sector cement profile. So the eight sector acoustic variable density logging tool is fully able to distinguish the cementing channeling.